Basics:
Repo: doc.us.to/~doctor/repo/V1/ (server runs 24hours a day)
check in=commit: send changes in working copy to repo (on server)
check out: making a working copy for the first time.
update: download changes in repo and make your working copy update.

1. Ubuntu (the main working copy)
   • $ ~/svn.sh # dayly use
   It runs two commands.
   1. $svn ci # send changes to repo.
   2. $ssh doc.us.to ~/svn-public # making the working copy on server update from just updated repo.
2. MacOS: Local working copy and repo on server
• $ ~/svn.sh # the same as Ubuntu
3. doc.us.to. # working copy and repo both on server
you should ssh to doc.us.to and update a working copy on server.
• doc.us.to:$ ~/svn-ci-server.sh
• Ubuntu:$ ~/svn-update.sh
• MacOS:$ ~/svn-update.sh
4. Windows
   • you should ssh to doc.us.to and update a working copy on server.
   • thus use is basically the same on doc.us.to.

• Option --keep-local

  How to remove a file from version control without deleting it?
  You want the --keep-local command-line option. This removes the file
  from version control without removing it from your filesystem.
  
  $ svn rm --keep-local my_important_file
  
      

• svn add a parent directory only without files below it.
  • --depth-empty or
  • -N (--non-recursive)